Seiko

Seiko Caliber 7A48: Quartz Chronograph Movement Guide
Factory specifications and practical moon-phase/date setting for Seiko’s 15-jewel 7A48 quartz chronograph, illustrated with three original VWS watches.
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Seiko Caliber 7A38: Quartz Chronograph Movement Guide
Explore Seiko 7A38 chronograph specs, functions and day-date controls, with original VWS 1984–1986 watch examples.
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1980s Vintage Seiko Watches: Automatics, Quartz & Design
A guide to the mechanical automatics, sophisticated quartz chronographs, SQ dress watches and electronic breakthroughs of 1980s Seiko.
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Seiko Rainbow: Models, Dials & Identification
Learn to identify vintage Seiko Rainbow designs through two real archive models: the 1982 7009-316A rainbow arc and 1979 11-4470 mother-of-pearl dress watch.
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Vintage Seiko Day-Date Discs: Kanji, Bilingual Calendars & Variations
Discover how vintage Seiko bilingual day wheels work, which languages collectors encounter and why setting differs by caliber.
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Vintage Seiko Chronograph History: From 6139 to 7A38 & 7A48
Trace Seiko chronograph innovation from early mechanical stopwatch watches to the multi-register analog quartz era, with real archival examples.
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Seiko Sports 150: Models, Features & History
Explore the 1980s Seiko Sports 150 chronographs, comparing real 7A38-7130 and 7A38-713A watches, case details, quartz functions and collecting checks.
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Seiko Sports 100: Models, Features & History
Explore Seiko Sports 100 models through original 1984–1986 VWS watches, 7A48 moon-phase chronograph features, identification and buying checks.
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